Is this research centre （ ）the foreign guests visited last w

Is this research centre （ ）the foreign guests visited last w is this research centre _____the foreign guests visited last Is this the research center____the foreigners visited last w 全国英语竞赛初三Is this reseach the foreign guests visited last week is this research center ___ the guests visited yesterday. Is this researsh center _______ the foreign guests visited l 1.IS this the exhibition___the foreign visitors visited last 1.Is this the last factory _____ the foreign friends visited Is this factory __________some foreign friends visited last Is this factory ___some foreign friends visited last Friday? Is this factory _____some foreign friends visited last Frida Is this factory ___ some foreign friends visited last Friday